UniPro R ™ (Reversible)

UniPro R

Pneumatic Emergency Valve Closure System

The only reversible emergency valve closure technology designed for 20-ton bullet tanks to 90-ton railcars, this patent-pending system prevents reportable releases of pressurized hazardous gases at the source. Improve your Risk Management Planning (RMP) scenarios with a pneumatic-powered system that not only promises easy installation and low maintenance, but also superior performance and reliability.

On occasion, customers have applications that make use of modified or unique hardware. In these cases, Powell offers an Application Evaluation Service.

The UniPro™ Pneumatic Valve Closure System has been engineered, designed, and field-tested to ensure reliable performance while reducing installation time, maintenance, and material cost.

That’s Reliable Engineering.


Easily opens tightly closed valves with just a pull on the lever. No need for t-bars and spanners. Pushing the lever in the opposite direction closes the valve. Reversible feature requires an additional air line (90 psig) and does not interfere with emergency operation mode. Designed for high-torque valves only.


Ideal for applications where air or nitrogen are readily available. Requires 90 psig to operate. Fail-closed design operates even if AC power or air pressure is lost.


Robust motor requires no lubrication, and is completely encased by a steel cover for protection and years of reliable service.

* Designed in accordance with The Chlorine Institute’s guidelines for valve closure systems.


Automatically responds to any alarm input, closing valves with 120 lb-ft of torque in less than 10 seconds.


Designed to close a variety of plug-type angle valves on railcars and tank trucks with dome sizes between 24 and 42 inches in diameter. For use on containers of chlorine*, sulfur dioxide, anhydrous ammonia, liquid hydrogen chloride, and other pressurized hazardous gases.


Easily mounts to the dome wall in seconds, without tools. Can be quickly removed from the valve handle without detaching from the dome wall to facilitate manual valve operation. Weighs just 28 pounds.

Designed for Durability

The actuator is constructed of aircraft-quality aluminum and high-grade carbon and stainless steels for maximum service life. The housing is sealed to prevent intrusion from dirt and water in outdoor applications, while a two-step polyurethane coating provides corrosion protection.

The UniPro™ is designed to stand alone as a complete system, or to integrate and interface with existing unloading components. The included air supply hose has a safety swing coupling to ensure a secure connection between actuator and gas supply.

UniPro Control Panel

Maximum Control

The UniPro™ Control Panel automatically activates the actuator to close the valve in the event of a gas leak, car movement, fire alarm, seismic event, security breach, process shutdown, or other monitored condition. You can also manually activate the system by depressing the emergency stop button on the panel.

Air Control Unit

The air control unit supplies the proper amount of clean pressurized air to the system. Available in two sizes to operate up to six UniPro™ actuators simultaneously.

The UniPro™ Pneumatic Valve Closure System is engineered to be the most versatile, efficient, and reliable unit on the market. The system includes the actuator, control panel, air control unit, and air supply hose.

UniPro air control unit

UL - CUL Approved

Powell Valve Closure System control panels (UniPro™, MaxPro™ RA & E-Pro®) are listed by Underwriters Laboratory to UL 508A for Enclosed Industrial Control Panels. Panels are listed by Underwriters Laboratory bearing the UL & CUL mark for use in the United States and Canada markets. In applications where a CSA listed control panel in Canada is required, please contact Powell for further information.